Grilled cheese. Calling it something else is asking, no, demanding to be punched in the face. The cheese may vary; my favorite is 1 mozzarella, and 1 provolone. Real butter is mandatory. Cheddar is an abomination, especially sharp, and dill pickles qualify you for a special circle of hell. Campbell's tomato soup is an acceptable accompaniment, but only Campbell's. Others need not apply.
This nailed it. And Campbell's only, and you'd better dunk it in there once in a while or you're doing it wrong...